Areca Tree Pests & Insects — Symptoms, Photos, Identification & Control

Regularly unroll or check the topmost leaf axils and tender spindle, especially in young plantations — nymphs and adults are visible with a close look.

• Regular inspection catches infestation before crown choke develops
• Maintain plantation hygiene and avoid excess shade that favours buildup

• Dimethoate 30% EC (Dimethoate) — 0.05% spray solution (approx. 1.7ml product per litre of water). Spray on the spindle and young fronds. Timing: Monthly intervals during active infestation.
• Dimethoate 0.05% spray on spindle and young fronds at monthly intervals is ICAR-CPCRI's documented recommendation (see dosage box); phorate 10G granules in the spindle are an alternative. Confirm the currently registered active ingredient and dose with your local KVK before spraying.

Carefully dig near the base of a suspect palm and examine the root zone — grubs are usually visible if present in damaging numbers.

• Entomopathogenic nematode soil drench (1.5 billion infective juveniles/ha) as part of ICAR-CPCRI's integrated programme
• Neem cake, 1kg/palm, applied May-June and September-October
• Well-decomposed manure only (avoid fresh, undecomposed organic matter, which can attract egg-laying beetles) and basin sanitation
• Light traps for adult beetles during their emergence period can help reduce local populations

• Imidacloprid 17.8 SL (Imidacloprid) — 0.25 ml per litre of water. Soil drench around the root zone. Timing: On confirmed grub presence; combine with neem cake (1kg/palm, May-June and September-October) and entomopathogenic nematode drench (1.5 billion infective juveniles/ha) as part of ICAR-CPCRI's integrated programme.
• Imidacloprid 17.8 SL @ 0.25ml/litre as a soil drench around the root zone is ICAR-CPCRI's documented recommendation (see dosage box), used alongside the biological measures above.

• Pheromone traps for monitoring and mass-trapping adult weevils (1 trap per hectare)
• Avoid unnecessary trunk/crown wounds, which attract egg-laying females
• Remove and destroy severely infested palms to prevent the pest spreading to neighbours

• Imidacloprid 17.8 SL (Imidacloprid) — 1 ml per litre of water. Prophylactic spot application into the leaf axils. Timing: Regularly as a preventive measure, especially near known infestation zones.
• Spinosad 45 SC (Spinosad) — 4 ml per litre of water. Curative spot application for confirmed early-stage infestation. Timing: As soon as tunnelling/ooze is confirmed — pair with pheromone traps (1 per hectare).
• Imidacloprid 17.8 SL @ 1ml/litre as a prophylactic spot application into leaf axils, or Spinosad 45 SC @ 4ml/litre for curative treatment of confirmed early-stage infestation (see dosage box) — both from ICAR-CPCRI guidance. Confirm the current product and application method with your local Agriculture Department, as this treatment needs to be done carefully and correctly to work.

This pest is difficult to treat effectively without experience — get a field visit rather than attempting crown injection without guidance.

• Keep the crown free of decaying organic matter that attracts egg-laying adults
• Pheromone traps for monitoring and mass trapping
• Destroy breeding sites — rotting manure heaps, dead palm stumps, farm waste piles
• Hook out adult beetles from the crown where accessible

• Insecticide-sand mixture (e.g. chlorpyriphos 20EC based dust) or naphthalene balls (Chlorpyriphos (where used)) — General practice mixes insecticide with sand at approx. 1:20 for axil filling — exact ratio and product vary by current label. Fill the top 2-3 leaf axils with the mixture. Timing: Preventively, refreshed every 40-45 days during high beetle activity.
• Filling the top leaf axils with an insecticide-sand mixture (see dosage box) is a widely published general practice — confirm the current recommended product with your local KVK, as this figure is general field practice rather than a confirmed arecanut-specific trial dose.

• Prune and destroy heavily infested plant parts
• Conserve natural predators like ladybird beetles and lacewings
• Control ants — they protect mealybug colonies from these predators, so ant control indirectly reduces mealybug spread

• Dimethoate 30% EC (Dimethoate) — 2 ml per litre of water (general contact/systemic dose for sap-sucking insects on plantation crops). Targeted spray directly on colonies in leaf axils and bunch stalks. Timing: On confirmed heavy infestation; avoid routine spraying, which also kills natural predators.
• A targeted spray of dimethoate @ 2ml/litre directly on colonies (see dosage box) can help in heavy infestations — this is a general sap-feeder dose, not an arecanut-specific trial figure, so confirm the current registered product and dose locally, and avoid unnecessary broad-spectrum spraying that also kills natural predators.

Scrape a suspected bump gently with a fingernail or blade — a scale insect's body comes away, unlike a leaf-tissue spot or sooty mould residue.

• Conserve natural predators and parasitoids — chalcidoid parasitic wasps are documented natural enemies of armored scale species
• Prune and destroy heavily infested material
• Control ants tending the colony, which protect scales from these natural enemies

• Horticultural oil sprays can smother scale colonies by blocking their protective covering; confirm the current locally-recommended product for heavier infestations — we could not confidently source a specific arecanut trial dose to publish here.

• Maintain irrigation during summer — moisture stress worsens outbreaks
• Encourage predatory mites and avoid unnecessary broad-spectrum spraying, which kills them along with the pest

• Wettable sulphur 80% WP (Sulphur) — 2g per litre of water (general miticide dose used across plantation/tree crops). Foliar spray, focused on leaflet undersides. Timing: On confirmed heavy mite buildup, typically hot dry weather.
• Wettable sulphur @ 2g/litre (see dosage box) is a widely published general miticide dose for tree/plantation crops — confirm the current registered product locally, as an arecanut-specific trial figure was not confidently available to us.

Open a suspect spathe/inflorescence and look for webbing, frass and the larvae themselves; a badly infested bunch has a dull, non-glossy surface instead of the normal sheen.

• Remove and destroy webbed/infested inflorescence material promptly — if all female flowers on a spadix are already damaged, cut and burn it entirely
• Clear unharvested rotten bunches and general plantation debris — sanitation is the single biggest lever against this pest, since poor sanitation is what attracts it
• Conserve natural parasitoids/predators where present (chalcidoid parasitoid wasps have been recorded attacking this pest's eggs)

• Targeted insecticide application to affected bunches is used in confirmed heavy infestation — we could not confidently source a specific product/dose for this pest on arecanut, so confirm the current registered product/dose locally.

• Inspect bunches in early morning, when many stink bugs are most active and visible
• Field sanitation and general IPM reduces populations alongside other sap/nut-feeding pests

• Confirm any targeted insecticide use with your local Agriculture Department — we could not confidently source a specific product/dose for this group on arecanut.

• Trapping and general rodent-control sanitation around the plantation
• Keep crowns and bunch areas free of debris that provides cover/nesting sites

• Rodenticide use, if needed, should follow label safety instructions carefully given the risk to non-target animals.

• Remove dead stumps and decaying organic debris near young plantings
• Avoid using undecomposed organic matter directly around the base of young palms

• Soil/basin treatment can be considered for confirmed, recurring termite pressure — confirm current product locally.

• If suspected, get a soil/root sample tested at a plant pathology lab or KVK before taking any action
• The fungus Paecilomyces lilacinus has been researched as a biological control for Radopholus similis on arecanut seedlings — ask your KVK whether a locally-available bio-nematicide formulation exists
• Organic matter and biological soil health practices generally support resilience against nematode pressure as part of broader soil management

• Chemical nematicides exist but carry significant handling/regulatory restrictions — this is a case where lab confirmation and KVK guidance genuinely matter before buying anything.